EP1646059A2 - Hocheffiziente Gegenelektrode für eine farbstoffsensibilisierte Solarzelle und Herstellungsverfahren - Google Patents

Hocheffiziente Gegenelektrode für eine farbstoffsensibilisierte Solarzelle und Herstellungsverfahren Download PDF

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Publication number
EP1646059A2
EP1646059A2 EP04257383A EP04257383A EP1646059A2 EP 1646059 A2 EP1646059 A2 EP 1646059A2 EP 04257383 A EP04257383 A EP 04257383A EP 04257383 A EP04257383 A EP 04257383A EP 1646059 A2 EP1646059 A2 EP 1646059A2
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Prior art keywords
electron transfer
counter electrode
conductive polymer
substrate
transfer layer
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French (fr)
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EP1646059A3 (de
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Yong Soo Kang
Bum Suk Jung
Young Jin Kim
Moon Sung Kang
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Korea Advanced Institute of Science and Technology KAIST
Korea Institute of Science and Technology KIST
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Korea Advanced Institute of Science and Technology KAIST
Korea Institute of Science and Technology KIST
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20—Light-sensitive devices
    • H01G9/2022—Light-sensitive devices characterized by he counter electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20—Light-sensitive devices
    • H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
    • H01G9/2031—Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/10—Organic polymers or oligomers
    • H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
    • H10K85/114—Poly-phenylenevinylene; Derivatives thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/542—Dye sensitized solar cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/14—Heterocyclic carbon compound [i.e., O, S, N, Se, Te, as only ring hetero atom]
    • Y10T436/145555—Hetero-N
    • Y10T436/147777—Plural nitrogen in the same ring [e.g., barbituates, creatinine, etc.]

Definitions

  • the present invention relates to a counter electrode for a dye-sensitized solar cell and a method of producing the same. More particularly, the present invention pertains to a counter electrode for a dye-sensitized solar cell which includes a photoelectrode containing a photosensitive dye molecules, in which the counter electrode is positioned opposite to the photoelectrode, and an electrolytic solution interposed between the photoelectrode and the counter electrode, and a method of producing the same. At this time, the counter electrode has an electron transfer layer.
  • the electron transfer layer has a structure in which one or more conductive materials, selected from the group consisting of a conductive polymer, platinum nanoparticles or a thin platinum film, a carbon compound, inorganic oxide particles, and a conductive polymer blend, are sequentially laminated.
  • a representative example of conventional dye-sensitized solar cells is a solar cell known in 1991 by Gratzel et al. in Switzerland (U.S. Pat. Nos. 4,927,721 and 5,350,644).
  • the solar cell suggested by Gratzel et al. is a photo-electrochemical solar cell employing an oxide semiconductor, which includes photosensitive dye molecules and titanium dioxide nanoparticles, and has the advantage of a production cost lower than a conventional silicone solar cell.
  • oxide semiconductor which includes photosensitive dye molecules and titanium dioxide nanoparticles
  • U.S. Pat. Nos. 5,350,644 and 6,479,745 disclose production of a solar cell, which mostly relates to an improvement in a photoelectrode and an electrolyte.
  • a counter electrode In a counter electrode according to the above patents, a platinum layer is laminated on a conductive substrate through a thermal decomposition process.
  • Korean Patent Registration No. 433630 discloses a dye-sensitized solar cell including a semiconductor electrode made of nanoparticle oxide, and a method of producing the same, in which an electronic structure and a surface characteristic of nanoparticle oxide, or a composition of an electrolyte, are changed to increase the voltage, thereby improving energy conversion efficiency.
  • a typical dye-sensitized nanoparticle oxide solar cell includes a nanoparticle oxide semiconductor cathode, a platinum anode, a dye applied on the cathode, and a redox liquid electrolyte employing an organic solvent or an alternative polymer electrolyte.
  • the dye-sensitized solar cell employing the liquid electrolyte is disadvantageous in that light conversion efficiency is less than about 8 - 9 % (@ 100 mW/cm 2 ) which is lower than that of a commercial silicon solar cell (about 12 - 16 % @ 100 mW/cm 2 ).
  • a photoelectrode containing a titanium oxide (TiO 2 ) layer on which a dye is adsorbed, a liquid or gel/solid electrolyte, and a counter electrode on which a platinum catalyst is laminated.
  • TiO 2 titanium oxide
  • Shibata et al. suggested a counter electrode which employs a conductive polymer, having an affinity for a gel electrolyte, instead of platinum, so as to improve the light conversion efficiency of a dye-sensitized solar cell using the gel electrolyte (Y. Shibata et al., Chem. Commun. 2730, 2003). They used the conductive polymer (poly(3,4-ethylenedioxy-thiophene)), which was doped with polystyrene sulfonate (PEDOT-PSS), instead of a conventional platinum catalyst layer, as the material for the counter electrode.
  • PEDOT-PSS polystyrene sulfonate
  • the use of the conductive polymer as the material for the counter electrode improves the light conversion efficiency of the gel electrolyte dye-sensitized solar cell in comparison with the use of the platinum catalyst. It is believed that this result is caused by a smooth electron transfer due to an improvement in contact between the gel electrolyte and counter electrode.
  • the present inventors have conducted studies into the lamination of an electron transfer promotion layer on a conventional platinum catalyst layer to increase a specific surface area of a counter electrode, resulting in the finding that electron transfer resistance is significantly reduced in comparison with a conventional counter electrode, thereby accomplishing the present invention.
  • an object of the present invention is to provide a highly efficient counter electrode for a dye-sensitized solar cell, which provides a large reaction area and efficiently reduces interfacial electron transfer resistance, and a method of producing the same.
  • the present invention provides a counter electrode for a dye-sensitized solar cell which includes a photoelectrode containing a photosensitive dye molecules, in which the counter electrode is positioned opposite to the photoelectrode, and an electrolytic solution interposed between the photoelectrode and the counter electrode.
  • the counter electrode is coated with an electron transfer layer which acts as a reduction catalyst.
  • the counter electrode includes one or more conductive materials selected from the group consisting of a conductive polymer, platinum nanoparticles or a thin platinum film, a carbon compound, and inorganic oxide particles.
  • the substrate of the counter electrode be selected from a conductive glass, a conductive flexible polymer sheet, or a thin platinum film.
  • the conductive polymer have an excellent affinity for an electrolyte, and be selected from the group consisting of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene], polyaniline, polypyrrole, poly[3-tetradecylthiopene], poly[3,4-ethylenedioxythiopene], polyacetylene, polyparaphenylene, polyphenylenesulfide, polythiopene, polyelementophthalocyanine, and a copolymer thereof.
  • a conductive polymer blend have an excellent affinity for an electrolyte, and include first and second polymers blended with each other in a weight ratio of 1 : 0.01 - 10.
  • the first polymer is selected from the group consisting of poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)-1,4-phenylenevinylene, polyaniline, polypyrrole, poly(3-tetradecylthiopene), poly(3,4-ethylenedioxythiopene), polyacetylene, polyparaphenylene, polyphenylenesulfide, polythiopene, polyelementophthalocyanine, and a copolymer thereof.
  • the second polymer is selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(epichlorohydrin)-ethylene oxide, and a copolymer thereof.
  • the platinum nanoparticles and inorganic oxide particles have a particle size of 10 - 1000 nm. More preferably, the particle size is 10 - 500 nm.
  • the carbon compound has a large reaction area, and be selected from the group consisting of carbon 60 (C 60 ) fullerene, carbon 70 (C 70 ) fullerene, carbon 76 (C 76 ) fullerene, carbon 78 (C 78 ) fullerene, and carbon 84 (C 84 ) fullerene.
  • the inorganic oxide particles be selected from the group consisting of titanium oxide, indium oxide, tin oxide, indium-tin oxide, aluminum oxide, silicon oxide, and a mixture thereof.
  • the present invention provides a method of producing a counter electrode for a dye-sensitized solar cell, which comprises (1) positioning two counter electrodes in an electrophoretic cell such that the two counter electrodes are spaced from each other at a predetermined interval; (2) dispersing a conductive material, which is selected from the group consisting of a conductive polymer, platinum nanoparticles, a thin platinum film, a carbon compound, and inorganic oxide particles, and a conductive polymer blend, in an organic solvent; and (3) dipping the counter electrodes of the step (1) in a solution produced in the step (2) or dropping a solution, in which the conductive material is uniformly dispersed, in a predetermined amount onto the counter electrodes, depositing the conductive material of the step (2) on the counter electrodes using electrophoresis and spin coating/thermal decomposition processes, and drying the resulting counter electrodes, thereby completing a coating process.
  • a conductive material which is selected from the group consisting of a conductive polymer, platinum nanoparticles
  • an electron transfer layer which is capable of promoting smooth electron transfer through an interface between an electrolyte and the counter electrode, is laminated, and a specific surface area of the counter electrode increases.
  • electron transfer resistance is significantly reduced in comparison with a conventional counter electrode, resulting in significantly improved energy conversion efficiency of the dye-sensitized solar cell according to the present invention.
  • an n-type nanoparticle semiconductor oxide electrode which includes dye molecules (not shown) chemically adsorbed onto a surface thereof
  • an electronic transition of the dye molecules from a ground state (D + /D) into an excited state (D + /D * ) is initiated to form a pair of electron holes, and electrons in the excited state are introduced into a conduction band (CB) of semiconductor nanoparticles.
  • the electrons, introduced into the semiconductor oxide electrode are transferred through interfaces between the particles into a transparent conductive oxide (TCO) which is in contact with the semiconductor oxide electrode, and then moved through an external wire 13, connected to the transparent conductive oxide, to a counter electrode 14.
  • TCO transparent conductive oxide
  • a photocurrent is caused by diffusion of the electrons introduced into the semiconductor electrode, and a photovoltage (V oc ) is determined by a difference between Fermi energy (EF) of the semiconductor oxide and a redox potential of the electrolyte.
  • EF Fermi energy
  • the present invention employs efficiently reduced electron transfer resistance between an electrolyte and an electrode and significantly improved light conversion efficiency that are caused by the lamination of a conductive material as an electron transfer layer, which is capable of providing a large reaction area to the counter electrode, on the counter electrode.
  • a conductive polymer, platinum nanoparticles, a carbon compound, or inorganic oxide particles may be coated with platinum, as the electron transfer layer, may be applied alone or in sequential combination on the counter electrode.
  • the counter electrode may be an electrode made of a thin platinum film or a transparent conductive material, and in detail, it may be a conductive substrate selected from a conductive glass, a conductive flexible polymer sheet, or a platinum layer.
  • the conductive glass substrate or conductive flexible polymer sheet be a transparent substrate coated with conductive indium-tin oxide or fluorine-tin oxide.
  • the conductive flexible polymer substrate may be a poly(ethylene terephthalate) sheet coated with indium-tin oxide or fluorine-tin oxide.
  • the conductive polymer which has an excellent affinity for an electrolyte, is employed.
  • the conductive polymer include poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene], polyaniline, polypyrrole, poly[3-tetradecylthiopene], poly[3,4-ethylenedioxythiopene], polyacetylene, polyparaphenylene, polyphenylenesulfide, polythiopene, polyelementophthalocyanine, and a copolymer thereof.
  • the conductive polymer blend include a conductive polymer selected from the group consisting of poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)-1,4-phenylenevinylene, polyaniline, polypyrrole, poly(3-tetradecylthiopene), poly(3,4-ethylendioxythiopene), polyacetylene, polyparaphenylene, polyphenylenesulfide, polythiopene, polyelementophthalocyanine, and a copolymer thereof, and another ion-conductive polymer selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(epichlorohydrin)-ethylene oxide, and a copolymer thereof.
  • the ion-conductive polymers are not limited to the above examples. At this time,
  • the polymer blend can be intermixed in a ratio of 10 ⁇ 50 wt% : 50 ⁇ 90 wt% between the former ion-conductive polymers. Also, the polymer blend can be intermixed in a ratio of 10 ⁇ 50 wt% : 50 ⁇ 90 wt% between the latter polymers.
  • the carbon compound provides a large reaction area, and is preferably selected from the group consisting of carbon 60 (C 60 ) fullerene, carbon 70 (C 70 ) fullerene, carbon 76 (C 76 ) fullerene, carbon 78 (C 78 ) fullerene, and carbon 84 (C 84 ) fullerene.
  • the inorganic oxide is firmly chemically adsorbed onto a surface of the platinum layer to stably coat the surface of the platinum layer.
  • the inorganic oxide acts as a protective coat for protecting the platinum layer, and provides a significantly enlarged redox reaction area. Additionally, it increases property stability of the particles in the course of coating using electrophoresis or a heat treatment.
  • the inorganic oxide particles activate an electron transfer, and are preferably selected from the group consisting of titanium oxide, indium oxide, tin oxide, indium-tin oxide, aluminum oxide, silicon oxide, and a mixture thereof.
  • a size of the platinum nanoparticles in conjunction with the inorganic oxide particles is preferably controlled to be 10 - 1000 nm, and more preferably, 10 - 500 nm.
  • a size of the particle is less than 10 nm, a charge carrier peculiarly acts like a particle in a box in views of quantum mechanics, increasing a band interval. Additionally, since a band edge moves, high redox potentials are formed.
  • the size of the particle is more than 1000 nm, the electron transfer resistance between the electrolyte and electrode undesirably increases, disturbing smooth electron transfer.
  • the counter electrode assures a large reaction area, thereby efficiently reducing the electron transfer resistance between the electrolyte and electrode, resulting in significantly improved light conversion efficiency.
  • two counter electrodes are positioned in an electrophoretic cell in such a way that they are spaced from each other at a predetermined interval (step 1).
  • the counter electrodes are positioned opposite photoelectrodes each including a titanium oxide nanoparticle layer onto which a photosensitive dye is adsorbed.
  • the conductive material which is selected from the group consisting of the conductive polymer, platinum nanoparticles, the carbon compound, and inorganic oxide particles, is dispersed in an organic solvent and spreaded uniformly (step 2).
  • the organic solvent be selected from the group consisting of methanol, ethanol, tetrahydrofuran, acetone, toluene, acetonitrile, and a mixture thereof.
  • the conductive material be controlled in an amount of 0.01 - 10 wt% based on the organic solvent.
  • the amount of the conductive material is less than 0.01 wt% based on the organic solvent, it is impossible to achieve significant electron transfer.
  • the amount is more than 10 wt%, flexibility is reduced due to high viscosity, and thus, adhesion to the counter electrodes as a coated base may be reduced.
  • a polymer which is selected from the group consisting of poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene)-1,4-phenylenevinylene, polyaniline, polypyrrole, poly(3-tetradecylthiopene), poly(3,4-ethylenedioxythiopene), polyacetylene, polyparaphenylene, polyphenylenesulfide, polythiopene, polyelementophthalocyanine, and a copolymer thereof, may be blended with another polymer, which is selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(epichlorohydrin)-ethylene oxide, and a copolymer thereof, in a weight ratio of 1:0.01-10, and then dispersed in the organic solvent.
  • the blending ratio deviates from the above range, an electron transfer promotion phenomenon undesir
  • the conductive material is deposited on the counter electrodes, rinsed, dried, and subjected to a doping process and spin coating/thermal decomposition processes, thereby producing the counter electrodes of the present invention (step 3).
  • the steps 1 to 3 are repeated once, twice, three times, or several times to form the electron transfer layer which consists of a conductive polymer layer, a platinum nanoparticle layer, a thin platinum layer, a carbon compound layer such as fullerene, an inorganic oxide particle layer, a conductive polymer blend layer, or a mixture thereof.
  • a more preferable structure of the counter electrode is as follows:
  • the counter electrode of the step (1) may be a base in which a conductive glass substrate, a conductive flexible polymer substrate, or a platinum layer are applied on a conductive substrate.
  • the conductive glass substrate or conductive flexible polymer substrate be a transparent substrate coated with conductive indium-tin oxide or fluorine-tin oxide.
  • the conductive flexible polymer substrate may be a poly(ethylene terephthalate) sheet coated with indium-tin oxide or fluorine-tin oxide.
  • the counter electrode of the step (3) may be left in an iodine (I 2 ) atmosphere for 20 - 25 min, thereby creating an iodine-doped counter electrode.
  • I 2 iodine
  • the type of dopant depends on the type of conductive polymer, and the dopant is not limited to iodine (e.g.: PEDOT:PSS).
  • the doping can be accomplished in a number of ways.
  • One of the doping process can be comprised of: coating a substrate layer with conducting polymers; and doping the coating layer with dopants under the vapor phase atmosphere (e.g.: Poly(2-methoxy-5-(2'-ethyhexyloxy)-(1,4-phenylenevinylene) (MEH-PPV:I 2 )).
  • the other doping process can be also carried out by coating a substrate with the admixture solution consisted of conducting polymers and dopants(acid) (e.g.: Poly(ethylenedioxythiopene)-poly(styrenesulfonate)(PEDOT:PSS)).
  • conducting polymers and dopants(acid) e.g.: Poly(ethylenedioxythiopene)-poly(styrenesulfonate)(PEDOT:PSS)
  • the doping can be accomplished by the following several ways: (a) Chemical Doping by Charge Transfer; (b) Electrochemical Doping; (c) Doping of Polyanilene by Acid-Base Chemistry; (d) Photodoping; (e) Charge Injection at a Metal-Semiconducting Polymer (Alan J. Heeger, J. Phys. Chem. B, Vol.105, No.36, 2001).
  • the counter electrode of the present invention functions to transfer electrons, which move through an external circuit, to a redox derivative.
  • the counter electrode is suitable to constitute any type of dye-sensitized solar cell regardless of a phase (liquid, gel, or solid) of an electrolyte and the kind of redox ions (e.g. imidazolium iodide, or alkaline metal salt iodide).
  • the counter electrode for the dye-sensitized solar cell according to the present invention promotes smooth electron transfer through an interface between the electrolyte, containing pairs of redox ions, and the counter electrode, thereby significantly improving the energy conversion efficiency of the dye-sensitized solar cell.
  • a method of producing the dye-sensitized solar cell including the highly efficient counter electrode according to the present invention comprises (1) dispersing oligomers in an organic solvent, adding an iodide salt to the oligomer solution, additionally dissolving iodine (I 2 ) in the resulting solution, and desolvating the organic solvent at a predetermined temperature for a predetermined time to produce an oligomer electrolyte, (2) casting the oligomer electrolyte onto a photoelectrode in which a photosensitive dye is adsorbed on a titanium oxide layer, (3) laminating the counter electrode, produced according to the present invention, on the oligomer electrolyte and pressing the resulting structure, and (4) attaching the photoelectrode and counter electrode to each other using an epoxy resin.
  • the solar cell produced through the above method according to the present invention has excellent light conversion efficiency in comparison with a conventional solar cell employing a counter electrode in which only a platinum layer is applied on a transparent conductive substrate.
  • FIG. 1 illustrates the operation of a conventional dye-sensitized solar cell according to the present invention.
  • an n-type nanoparticle semiconductor oxide electrode which includes dye molecules (not shown) chemically adsorbed onto a surface thereof
  • an electronic transition of the dye molecules from a ground state (D + /D) into an excited state (D + /D * ) is initiated to form a pair of electron holes, and electrons in the excited state are introduced into a conduction band (CB) of semiconductor nanoparticles.
  • the electrons, introduced into the semiconductor oxide electrode are transferred through interfaces between the particles into a transparent conductive oxide (TCO) which is in contact with the semiconductor oxide electrode, and then moved through an external wire 13, connected to the transparent conducting oxide, to a counter electrode 14.
  • TCO transparent conductive oxide
  • a redox electrolyte is introduced between the counter electrode 14 and the semiconductor oxide electrode, and a load (L) is connected to the transparent conductive oxide and counter electrode 14 in series to measure a short-circuit current (J sc ), an open-circuit voltage (V oc ), and a fill factor (FF), thereby evaluating efficiency of the solar cell.
  • J sc short-circuit current
  • V oc open-circuit voltage
  • FF fill factor
  • a photocurrent is caused by the diffusion of the electrons introduced into the semiconductor electrode, and a photovoltage (V oc ) is determined by a difference between Fermi energy (EF) of the semiconductor oxide and a redox potential of the electrolyte.
  • FIG. 2 illustrates the dye-sensitized solar cell including the counter electrode according to the present invention.
  • the dye-sensitized solar cell of the present invention includes a photoelectrode 10, a counter electrode 20, and an electrolyte 30 interposed between them.
  • the photoelectrode 10 is coated with semiconductor nanoparticles 40, and an organic dye 50 is adsorbed onto the semiconductor nanoparticles 40.
  • the counter electrode 20 is coated with platinum 60, and positioned opposite the photoelectrode 10.
  • the electrolyte 30 is interposed between the photoelectrode 10 and counter electrode 20.
  • a conductive polymer as an electron transfer layer is applied on the counter electrode 20 coated with a base platinum layer.
  • platinum nanoparticles are electrochemically applied on the counter electrode, or the platinum nanoparticles are electrochemically applied on the counter electrode and the conductive polymer is then laminated on the resulting counter electrode.
  • inorganic oxide particles are electrochemically applied on the counter electrode and a platinum layer is then laminated on the resulting counter electrode (not shown).
  • FIGS. 3a to 3c are FE-SEM (field emission scanning electron microscope) images of surfaces of the counter electrodes.
  • the image (a) illustrates a SnO 2 :F conductive glass surface coated with the base platinum layer
  • the image (b) illustrates a surface of the conductive polymer which is laminated on the base platinum layer.
  • a conductive polymer thin layer is uniformly laminated on a surface of the platinum layer.
  • the counter electrode for the dye-sensitized solar cell in the counter electrode for the dye-sensitized solar cell according to the present invention, a reaction area increases, the conductive polymer having an excellent affinity for the electrolyte is introduced to an interface between the electrolyte and a platinum catalyst, or the conductive polymer having an excellent affinity for the electrolyte is introduced to a surface of the counter electrode while the reaction area increases, resulting in smooth electron transfer through the interface between the electrolyte, containing pairs of redox ions, and counter electrode.
  • energy conversion efficiency of the dye-sensitized solar cell is significantly improved.
  • the efficiency is significantly improved in comparison with a conventional dye-sensitized solar cell employing a counter electrode coated with only a platinum layer.
  • the counter electrode for the dye-sensitized solar cell according to the present invention can be commercialized, and is very useful to produce a highly efficient and useful dye-sensitized solar cell.
  • the highly efficient dye-sensitized solar cell employing the counter electrode of the present invention reduces the consumption of fossil fuel, which totally depends on imports and is used to generate electric power, resulting in reduced energy dependence on fossil fuels, thereby contributing to reduced pollution as a next generation clean energy source.
  • the two counter electrodes coated with the base platinum layer were positioned in an electrophoretic cell. In this regard, a distance between the two electrodes was maintained at 1 mm.
  • the predetermined amount of platinum nanoparticles having a particle size of about 500 nm or less was put into a mixed solution of acetone/ethanol (1/1, v/v), and subjected to an ultrasonic treatment to be completely dispersed.
  • a predetermined voltage was applied while the counter electrodes were completely dipped in the platinum nanoparticle solution, thereby inducing electrophoresis of the platinum particles.
  • a counter electrode, on which platinum nanoparticles were applied, was produced according to the same procedure as in example 2, and a conductive polymer was applied on the resulting counter electrode using a spin coating process and then subjected to a doping process according to the same procedure as example 1.
  • the two counter electrodes coated with the base platinum layer were positioned in an electrophoretic cell as in example 2.
  • the distance between the two electrodes was maintained at 1 mm.
  • a predetermined amount of highly pure fullerene was dispersed in toluene, and then blended with a predetermined amount of acetonitrile solution. Subsequently, a predetermined voltage was applied for a predetermined time while the counter electrodes were completely immersed in the fullerene solution, thereby inducing electrophoresis of fullerene and deposition of fullerene on surfaces of the electrodes.
  • the conductive polymer was applied on the dried counter electrodes using a spin coating process and then subjected to a doping process as in example 1, or alternatively, the dried counter electrodes were dipped in an H 2 PtCl 6 aqueous solution and then electrochemically reduced to deposit the platinum particles on the fullerene surface.
  • the two counter electrodes coated with the base platinum layer were positioned in an electrophoretic cell as in example 2.
  • the distance between the two electrodes was maintained at 1 mm.
  • a predetermined amount of inorganic oxide nanoparticles e.g. indium-tin oxide, ITO
  • ITO indium-tin oxide
  • a predetermined voltage was applied while the counter electrodes were completely dipped in the inorganic oxide-dispersed solution, thereby inducing electrophoresis of the inorganic oxide particles.
  • V OC open-circuit voltage
  • J SC short-circuit current
  • FF fill factor
  • ⁇ energy conversion efficiency
  • the open-circuit voltage (V oc ) is a potential difference formed at both ends of the solar cell when the solar cell is exposed to light while a circuit is opened, that is to say, the solar cell encounters infinite impedance.
  • V max a maximum value of V oc
  • J sc The short-circuit current (J sc ) is a current density of the solar cell when the solar cell is exposed to light while a circuit is shorted, that is to say, the solar cell has no external resistance.
  • the short-circuit current depends on the intensity of incident light and wavelength distribution, but after these conditions are fixed, the value depends on how effectively electrons, which are excited by light absorption and re-combined with holes without dissipation, are transferred from an inside of the cell to an external circuit. At this time, dissipation caused by re-combination may occur inside a material or at interfaces between materials.
  • the fill factor is obtained by dividing the product of current density and voltage (V max X J max ) at the maximum power point by the product of Voc and J sc . Accordingly, the fill factor may be used as an index indicating how similar a shape of a current-voltage (J-V) curve is to a quadrangle when the solar cell is exposed to light.
  • Equation 2 V max ⁇ J max P in ⁇ 100
  • the energy conversion efficiency ( ⁇ ) of the solar cell is a ratio of the maximum power, generated by the solar cell, to incident light energy (P in ).
  • the electron transfer resistance through an interface between an electrolyte and an electrode was evaluated using AC impedance analysis in order to estimate the electron transfer efficiency of the counter electrode of the present invention.
  • the AC impedance analysis was conducted according to a method suggested by Hauch and Georg (A. Hauch and A. Georg. Electrochimica Acta 46, 3457, 2001).
  • the oligomer electrolyte was interposed between two counter electrodes produced through the same procedure, and combined using an epoxy resin while the resulting structure was fastened together using a clip.
  • Impedance was measured under conditions of potentiostat mode/500 mV amplitude using a ZAHNER IM6e impedance analyzer (Germany) within a frequency range of 0.1 - 100,000 Hz.
  • the measurement results were plotted by a Nyquist plot or a Bode plot, and the electron transfer resistance was gained through an equivalent circuit analysis (i.e. R(C(RW)) or R(Q(RQ))) employing the measurement data.
  • a counter electrode was produced as in example 1.
  • poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) as a conductive polymer was dissolved in a mixed organic solvent of methanol and tetrahydrofuran (8:2, weight ratio) in an amount of 0.1 wt%, and then subjected to a spin coating process on the counter electrode coated with platinum. Subsequently, the counter electrode coated with MEH-PPV/Pt was left in an iodine (I 2 ) atmosphere for 20 min to produce the iodine-doped counter electrode.
  • I 2 iodine
  • a dye-sensitized solar cell was produced using the resulting counter electrode through the same procedure as in example 10 (sample 1).
  • PEO poly(ethylene oxide)
  • a counter electrode coated with only platinum was used to produce a dye-sensitized solar cell (sample 3).
  • FIGS. 3a to 3c are FE-SEM images of surfaces of the counter electrodes.
  • the image (a) illustrates a SnO 2 :F conductive glass surface coated with a base platinum layer
  • the image (b) illustrates a surface of the conductive polymer which is laminated on the base platinum layer (sample 3).
  • a conductive polymer thin layer is uniformly laminated on a surface of a platinum layer.
  • a counter electrode was produced through example 2.
  • the predetermined amount of platinum nanoparticles (Aldrich Co.) having a particle size of about 30 - 50 nm was put into 40 g of mixed solution of acetone/ethanol (1/1, v/v), and subjected to an ultrasonic treatment to be completely dispersed. 250 V of voltage was applied while the counter electrode was completely immersed in the platinum nanoparticle solution to conduct electrophoresis for 1 hour. After the electrophoresis, the counter electrode was separated from a cell, rinsed with a highly pure ethanol solution, and dried, thereby completing the production of the resulting counter electrode.
  • a dye-sensitized solar cell was produced using the resulting counter electrode through the same procedure as example 10 (sample 4).
  • the counter electrode, on which the platinum nanoparticle layer was laminated was heat treated at 450°C for 20 min.
  • a dye-sensitized solar cell was produced using the resulting counter electrode through the same procedure as example 10 (sample 5).
  • a counter electrode coated with only platinum was used to produce a dye-sensitized solar cell (sample 7).
  • FIGS. 3a to 3c are FE-SEM images of surfaces of the counter electrodes.
  • the image (c) illustrates a surface of the platinum nanoparticle layer which is laminated on a base platinum layer according to the above procedure (sample 4).
  • a counter electrode was produced through example 3.
  • the counter electrode was produced according to the same procedure as sample 5 in experimental example 2, and a conductive polymer layer was laminated according to the same procedure as sample 2 in experimental example 1.
  • a dye-sensitized solar cell was produced using the resulting counter electrode through the same procedure as in example 10 (sample 8).
  • Energy conversion efficiencies (light conversion efficiencies) of the dye-sensitized solar cells were evaluated at an incident light condition of 100 mW/cm 2 .
  • An open-circuit voltage, a short-circuit current, a fill factor, and energy conversion efficiency were measured in the same manner as in the preceding examples, and the results are described in Table 3.
  • Counter electrodes were produced through examples 4 to 6.
  • fullerene C60 SES Research, USA
  • toluene in a concentration of 1 mM (1.14 mL)
  • 40 mL of acetonitrile solution 40 mL
  • 100 V of voltage was applied for 1 hour while the counter electrodes were completely dipped in the fullerene-dispersed solution, thereby inducing the electrophoresis of fullerene and deposition of fullerene on surfaces of the electrodes.
  • the conductive polymer was applied on the dried counter electrodes using a spin coating process and then subjected to a doping process using iodine according to the same procedure as for sample 2 in experimental example 1.
  • a dye-sensitized solar cell was produced using the resulting counter electrodes through the same procedure as example 10 (sample 9).
  • the counter electrodes were dipped in a H 2 PtCl 6 aqueous solution (0.1 M) and platinum particles were deposited on a surface of fullerene by an electrochemical reduction (-350 mV vs SCE).
  • a dye-sensitized solar cell was produced using the resulting counter electrodes through the same procedure as example 10 (sample 10). Energy conversion efficiencies (light conversion efficiencies) of the dye-sensitized solar cells were evaluated at an incident light condition of 100 mW/cm 2 .
  • ITO indium-tin oxide
  • Aldrich Co. acetone/ethanol (1/1, v/v)
  • 250 V of voltage was applied while the counter electrodes were completely immersed in the ITO nanoparticle solution to conduct electrophoresis for 1 hour.
  • the reaction area increases, a conductive polymer having an excellent affinity for an electrolyte is introduced to an interface between the electrolyte and a platinum catalyst, or the conductive polymer having an excellent affinity for the electrolyte is introduced to a surface of the counter electrode while the reaction area increases, resulting in smooth electron transfer through the interface between the electrolyte, containing pairs of redox ions, and counter electrode.
  • the counter electrode for the dye-sensitized solar cell according to the present invention can be commercialized, and is very useful to produce a highly efficient and useful dye-sensitized solar cell.

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EP04257383A 2004-10-06 2004-11-29 Hocheffiziente Gegenelektrode für eine farbstoffsensibilisierte Solarzelle und Herstellungsverfahren Withdrawn EP1646059A3 (de)

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